Definition: In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
Input: ['273', '337', '113', '107', 'm', 'j', '477', 'f', 'c', 'm', 't', 'g', 'w']

0, 1, 2, 3, 4, 7